Getting libxo

libxo now ships as part of the FreeBSD Operating System (as of Release 11).

libxo source code lives on github:

The latest release of libxo is available at:

We’re using Semantic Versioning to number our releases. libxo is open source, distributed under the BSD license. We follow the branching scheme from A Successful Git Branching Model: we do development under the “develop” branch, and release from the “master” branch. To clone a developer tree, run the following command:

git clone -b develop

Issues, problems, and bugs should be directly to the issues page on our github site.

Downloading libxo Source Code

You can retrieve the source for libxo in two ways:

  1. Use a “distfile” for a specific release. We use github to maintain our releases. Visit the release page to see the list of releases. To download the latest, look for the release witeh the green “Latest release” button and the green “libxo-RELEASE.tar.gz” button under that section.

After downloading that release’s distfile, untar it as follows:

tar -zxf libxo-RELEASE.tar.gz
cd libxo-RELEASE

Solaris Users

Note: for Solaris users, your “tar” command lacks the “-z” flag, so you’ll need to substitute “gzip -dc $file | tar xf -” instead of “tar -zxf $file”.

  1. Use the current build from github. This gives you the most recent source code, which might be less stable than a specific release. To build libxo from the git repo:

    git clone
    cd libxo

    Be Aware

    The github repository does not contain the files generated by “autoreconf”, with the notable exception of the “m4” directory. Since these files (depcomp, configure, missing, install-sh, etc) are generated files, we keep them out of the source code repository.

    This means that if you download the a release distfile, these files will be ready and you’ll just need to run “configure”, but if you download the source code from svn, then you’ll need to run “autoreconf” by hand. This step is done for you by the “” script, described in the next section.

Building libxo

To build libxo, you’ll need to set up the build, run the “configure” script, run the “make” command, and run the regression tests.

The following is a summary of the commands needed. These commands are explained in detail in the rest of this section:

sh bin/
cd build
make test
sudo make install

The following sections will walk through each of these steps with additional details and options, but the above directions should be all that’s needed.

Setting up the build

Run the “” script to set up the build. This script runs the “autoreconf” command to generate the “configure” script and other generated files:

sh bin/

Note: We’re are currently using autoreconf version 2.69.

Running the “configure” Script

Configure (and autoconf in general) provides a means of building software in diverse environments. Our configure script supports a set of options that can be used to adjust to your operating environment. Use “configure --help” to view these options.

We use the “build” directory to keep object files and generated files away from the source tree.

To run the configure script, change into the “build” directory, and run the “configure” script. Add any required options to the “../configure” command line:

cd build

Expect to see the “configure” script generate the following error:

/usr/bin/rm: cannot remove `libtoolT': No such file or directory

This error is harmless and can be safely ignored.

By default, libxo installs architecture-independent files, including extension library files, in the /usr/local directories. To specify an installation prefix other than /usr/local for all installation files, include the –prefix=prefix option and specify an alternate location. To install just the extension library files in a different, user-defined location, include the “–with-extensions-dir=dir” option and specify the location where the extension libraries will live:

cd build
../configure [OPTION]... [VAR=VALUE]...

Running the “make” Command

Once the “configure” script is run, build the images using the “make” command:


Running the Regression Tests

libxo includes a set of regression tests that can be run to ensure the software is working properly. These test are optional, but will help determine if there are any issues running libxo on your machine. To run the regression tests:

make test

Installing libxo

Once the software is built, you’ll need to install libxo using the “make install” command. If you are the root user, or the owner of the installation directory, simply issue the command:

make install

If you are not the “root” user and are using the “sudo” package, use:

sudo make install

Verify the installation by viewing the output of “xo --version”:

% xo --version
libxo version 0.3.5-git-develop
xo version 0.3.5-git-develop